Yes, "old banger" usely applies to a car, but for me it works here too because the extractor hood is likewise a clapped out device that is almost part of the family. This is probably not what they'd say in N. America (also re. "clapped out"), but still ... Any more info on context?

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Note added at 8 hrs (2007-01-23 06:47:33 GMT)
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about typewriters:

As I was restoring this machine and tweaking it up for the website, I compared this old banger to my own personal Streamliner, and it's truly almost as nice as that one.
http://mrtypewriter.tripod.com/remingtonstreamliner.htm

perhaps too casual?

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Note added at 9 hrs (2007-01-23 08:14:25 GMT)
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rust bucket

a few more (some of them angrier) variations showing "it was really time for that piece of ... to go."

* if its the hood and the pipe - and Möhre (=carrot) seems to be referring to the exhaust pipe. Without a hood, it would just be "pipe" or "stove pipe."

the (our) good old pipe (as in: we did like it/did not hate it but it had to go anyway)

or:
good-for-nothing (piece of an) exhaust pipe (exhaust hood)
sorry excuse for an exhaust pipe
worn-out piece of a pipe
old, decrepit pipe
worn-out stove hood (exhaust hood)
sorry piece of equipment/pipe
no-good-piece of junk/ pipe


http://www.searoom.com/veleda/logsec01/stove.htm
worn out twenty-three year old Kenyon stove

http://language.bin.org/ref/dict/?t=sorry
good-for-nothing goldbrick"; "the car was a no-good piece of junk" [syn: good-for-nothing, good-for-naught, meritless, no-account, no-count, no-good] ...

http://en.wikipedia.org/wiki/Extractor_hood
exhaust hood, stove hood, ...

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Note added at 1 day10 hrs (2007-01-24 08:47:16 GMT)
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if it's ... (corr.)

Here in Vermont we call those items 'old clunker'....